Coal mining apparatus



AU8- 28, 1934, N. D. I EvlN Er Al. 1,971,862

COAL MINING APPARATUS Filed oct. 18..'1929 s sheets-sheet 1 c* D u 2 Nlg" a @Si i lli- @wf/h;

Aug. 2s, 1934. N'. D. LEWN E AL 1,971,862

COAL MINING APPARATUS Filed Oct. 18, 1929 3 Sheets-Sheet 2 CTT PatentedAug. 28, 1934 PATENT OFFICE COAL MINING APPARATUS Nils D. Levin andErnst Feodor Muller, Columbus, Ohio, assignors to The JeffreyManufacturing Company, Columbus, Ohio,

tion of Ohio Application October 18,

38 Claims.

The present invention relates to mining machines of the type comprising,generally, a truck movab-le over suitable trackways, a turn-table on thetruck and a kerf cutter supported from the :turn-.table and verticallytranslatable relative thereto.

The invention has to do particularly with mechanism for driving the kerfcutter 'and for adjusting it to thedesired operating planes., v

In the accompanying drawings, we have shown an illustrative embodimentof our invention, and without further discussion of the general aspectsof the invention, we shall proceed to describe it with reference tothedrawings, wherein: Y

Figure 1 is a'plan' View of the complete machine.

Figure2 is a side elevation.

Figure 3 is an enlarged plan View with parts removed to reveal others.

Figure 4 is a, vertical ,section through the cutter driving andadjusting mechanism.

Figure 5 isa section on line 5-5 of Figure 4.

Figure6 is an enlarged planview of a clutch included in the cutterdriving train, and

Figure '7 is an axial section of the clutch of Figure 6.

Referring to the drawings, the'mining machine truck is designated by thereference numeral 100 and has mounted thereon a turn-table 101 which issupported, through the intermediary 'of an annular supporting frame101', on three pedestals 102, 103 and 104. A motor 105 mounted on thetruck through suitable mechanism is adapted to drivefa cable reel 106,the truck wheels, and throughfverticalscrews disposed in pedestals 102,103 'and 104is adapted to raise and lower the turn-table 101, properdiiferential actuation of the screws being effective to tilt theturntable as desired.

Disposed on the turn-tablev is a winding drum 107 which through a cable108 anchored to an element fixed on the truckv is adapted to swing theturn-table' in either direction depending on the direction in which thecable is trained around the turntableand upon the direction of drumrotation. Thus, the mining machine embodies self-'contained means forpropelling it over the mine tracks to move it from one part of the mineto the other, or to operatively engage its cutting instrumentality in acoal face, and also selfcontained power means to elevate and swing itsturn-table.

Fixed on turn-table 101 is a projecting arm 1 having a number oflongitudinally extending slots 4 through which it is adjustably securedto the turn-table by means of bolts and nuts 3. A cap a Corporaisza,serial No. 400,665

cap screw may be adjusted to displace the arm away from the turntable orto permit movement of the arm toward the turntable. Depending from theprojecting end of the arm 1 is a tubular portion or bearing '7. Alsodepending from the arm inwardly of bearing 7 is a guide frame 8 havingopposed parallel guide grooves 9. Between the flanges 40 and 41 of thesegrooves, Figure 5, are engaged flanges 42 of a verticallyadjustablevbearing frame 10. A cutter bar support 11 has a circularflange 43 journalled in a bearing ring 44 of frame 10. The bearing ringrests on a shoulder of the ange and is retained thereon by means of anannulus 44.

In a vertical bearing sleeve 12 formed in the turn-table to the rear ofarm 1 and intersecting the axial line of the latter, is journalled adrive shaft 13 having fixed thereto a bevelled gear 14 engaging a pinion15 xed on the armature shaft 16 of a reversible electric motor 17 whichis mounted on turntable 101 to project therebelow, Figure 3. Suitablecontrol means for the motor are provided, but since such means are wellunderstood, their illustration has not been thought necessary. Asprocket wheel 18 is loose on the upper end of shaft 13 but is adaptedto be engaged therewith by means of a clutch generally indicated at 19.In view of the restricted spaces in which the machine is required tooperate, a special clutch of compact form has been provided and will bedescribed in detail hereinafter. At its lower end shaft 1 3 has fixedthereto an eccentric 13 which, through a strap 13" is adapted to drivedrum 107 through mechanism, as shown for example in the copendingapplication of Nils D. Levin, Serial No. 296,990, led August 2, 1928.

A sprocket-chain 20 connects sprocket 18 with a sprocket 21 stepped onthe upper edge of bearing '7. Sprocket 21 has an upwardly extending boss21 journalled in a bearing 23 formed in a plate 24 fixed to arm 1, thebearing being coaxial with bearing '7. Sprocket 21 is also integral witha sleeve 22 depending in bearing '7 in spaced relation tothe inner wallsof the latter. Sleeve 22 is interiorly and longitudinally fluted to forma spline connection with the externally fluted head of a sleeve 25,sleeves 22 and 25 forming a hollow torque shaft adjustable as to lengthfor driving rcutter sprocket 26 which is secured to the lower plate 54and is guided by blocks 55 and 56.

end of sleeve 25. Sprocket 26 engages a chain 27 having lugs 28 whichcarry bits 29, chain 27 traveling in suitable guides of an elongatedhorizontal cutter frame 109 in the well known manner.

rIhe cutter support 1l has a head 30 stepped on sprocket 26. Head 30 hasa spider integral therewith which supports guide flange 43 alreadydescribed, and concentric with and spaced from the latter, an upwardlyextending sleeve 31 surrounding sleeve 22 within bearing 7, a bushing 33being interposed between it and the sleeve.

Sleeve 25 is interiorly threaded at its upper end to form a nut 34engaged byV a screw35 which latter at its upper end has a yradiallyexpanded integral flange 36 supported on the boss or crown of sprocket21 through the intermediary of a bushing 36. Flange 36 is preferablyrecessed so as to form shoulders 37 adapted to be engaged by the end 38of a bolt 39 slidable on plate 24.l

The weight of the cutter bar is supported by flange 36-through screw 35and `,sleeve 25 and since the flange restsl on the crown of sprocket 21it will normally rotate with the latter. Under these conditions sincenut 34 likewiserotates with the sprocket,` there will be no relativerotary movement of the screw and nut and the elevationrof the kerfcutterwill be unaffected. vI1", however, the end 38 of bolt 39 is moved toengage a shoulder 37 of flange 36, screw 35 will be arrested and will nolonger rotate with sprocket 2,1. Since nut 34 must rotate with sprocket21 however, itwill be moved along the screw so as to adjust the cutterbar` vertically. The direction of movement'of the nut longitudinally ofthe screw will, of course, depend on the direction of rotation ofsprocket 21, such direction, of course, being determined by thedirection of rotation of armature shaft 16.` Y c A boss 45 isfformed onbearing frame 10 and has a vertical bore in which is vertically movablea bolt 46.

:A number of arcuately arranged apertures 47v in support 11 are adaptedto be selectively engaged by bolt 46'to lock the kerf cutter in thedesired position of angular adjustment relative to frame 10. Frame 10,it will be remembered,` is secured against rotation about shaft25through its engagement with guide 8. i f

The upper end of bolt 46 is circumferentially recessed as at 48 and isengaged by a yoke 49 xed ori a shaftV 5() which is journalled inbearings 51 on support 11 in a transverse position relative to arm l. Alever 52 is ixedto each end of'shaft 50 and a torsion spring 53constantly urges the latter in such a direction as to hold bolt 46'inengagement with the selected aperture 47.

It will thus be evident that kerf cutter 109 is horizontally movablewith the truck and is vertically and angularly movable relative to thetruck due to its connection with the turn-table. Further,the cutter barris vertically adjustable yrelative to the turn-table and may be securedin various angular positions relative -to its axis which is defined bythe torque shaft 22, 25.

Bolt 39 is slidable between plate 24 and cover The bolt is'provided-witha longitudinal slot 58 in which is disposed .compression spring 57. Atone end the spring abuts a lug 59 xed to plate 24 andy at itsother endthe end wall of slot'58, thus tending to urge the bolt away from flange86y and outof the path of shoulders 37. A lever 60 is mounted upon a pin61 atthe end of bolt 39 remote from iiange 36 in such ainanner thatswinging vof the lever in either direction will engage'one of its lugs62 with a face 63 of the bolt to move the latter into the path ofshoulders 37. Since the spring 57 tends to release the bolt, theoperator must hold the lever 60 if it is to be engaged to cause verticaladjustment of the kerf cutter.

It would be merely a matter of conjecture for the operator to stoptheelevating mechanism at its limits, and to prevent seriousv resultsfrom overrunning of the mechanism, automatically acting stop devices areprovided.

Bolt 39 is provided with an arm 65 to which is attached one end of achain 64. At a distance from its point of attachment, the chain ispassed through an aperture in plate 24 and its lower end connected to avertical bolt 66 yieldingly anchored in frame 10. AThe length of thechain is so chosen that when thercutter bar approaches its lower limitof movement, thechain is tensioned, thereby retracting bolt 39 andinterrupting the cutter bar movement. At its side oppositearm 65, bolt39 is provided with a shoulder 69 engaged by a lever 68.11xed on alvertical shaft 67 journalled for rocking movements. At its lower end,shaft 67 isprovided with an arm 70 projectingin the opposite directionfrom lever 68 and provided at itsdistal end with a transverselyextending boss intwhich is disposed a plunger 72 projected under theforce of a compression spring 71. The end of plunger 72 is positioned inthe path of a cam 73 formed on-frame 10. v Plunger 72 forms in effect acam follower engaged by cam 73 at the upper` limit of travel of thecutter bar to rock shaft 67 in a direction to retract bolt 39. Due tothe described mechanism, the bolt Will be released and lever 60 returnedto neutral position at both limits of the vertical adjustment of thecutter bar. If the cutterbar is moving up, for example, and cam- 73abuts plunger 72, shaft 67 will be rocked and the'bolt 39 withdrawnwthout material compression ofspring 71. If now it is desired to movethe cutter bar downwardly, the motor will be reversed and lever 60 movedto engage the bolt, thus rocking shaft 67 and further compressing spring71, plunger 72, of course, beingv still in engagement with cam 73. Boltor plunger 66 is similarly resiliently seated to permit the reengagementof bolt 39 when it is desired to move the cutter bar up from its lowerlimit position.

t Referring now to Figs. 6 and 7, it will be noted the upper end ofshaft 13 is radially flanged and provided with teeth as at 80. Sprocket18 is provided with a crown toothed asr at 81 in the same manner as theflange. vA collar 82 is interiorly toothed as at 83, its teeth beingadapted to ft between registering teeth and 81 to lock the shaft andsprocket together.

- Shaft 13 is provided at its upper end with a threaded-.radial bore inwhich engages a screw 84 provided with an annular shoulderf85. A plate86 secured to collar 82 has a central aperture through which the upperend of screw 84 passes, the lower margins of the aperture resting onshoulder 85. Above plate 86 a flat handle or hand wheel 87 is secured tothe stem of the screw. A spring 88 interposed between hand wheel 87 andplate 86 serves to prevent accidental relative movement of the handwheel to the plate. Screw 84 is axially bored at itsv top and fittedwith a lubricant receiving device 89.

It will be seen that by rotation of hand wheel 87 in a direction todisplace screw84 upwardly Y relative to shaft 13, the teeth 83 of collar82 may be withdrawn from engagement with teeth 81 of the sprocket sothat rotation of shaft 13 willnot be imparted to the latter. Movementvofthe screw in the opposite direction Will reengage teeth 83 and 8l whenthe latter come into register with teeth 80. The described clutch isextremely compact and is thus peculiarly adapted for use in thedescribed connection. Lowv ceilings encountered in mines would make theuse of an ordinary clutch impossible.

It will be understood that while we have neces sarily described aparticular embodiment of our invention, we do not limit ourselves exceptas determined in the following claims.

1. In a machine of the class described, movable supporting means, a kerfcutter adjustable relative to said supporting means, a motor on saidsupporting means, a hollow torque shait adjustable as to lengthoperative between said motor and said cutter, said shaft comprising apair of telescoping portions, avscrew concentric with said portions, andengaging a nut xed to one of said portions, and means securing saidscrew against longitudinal movement relative to the other of saidportions, said screw and nut rotating with said shaft and holding saidshaft and therewith said cutter in adjusted position.

2. In a machine of the class described, movable supporting means, a kerfcutter adjustable relative to said supporting means, a motor on saidsupporting means, a hollow torque shaft adjustable as to lengthoperative between said motor and said cutter, said shaft comprising apair of teescoping portions, a'screw concentric with said portions andengaging a nut xed to one of said portions, means securing said screwagainst longitudinal movement relative to the other of said portions,said screw and nut `rotating with said shaft and holding said shaft andtherewith said cutter in adjusted position, and means for re'- strainingsaid screw against rotation while the nut revolves to adjust said shaftand therewith the cutter.

3. In a machine of the class described, movable supporting meansincluding an elevated horizon- 4. In a machine of the class described,movable supporting means including an elevated horizontally projectingportion, an elongated vertically translatable horizontal kerf cutterbeneath said portion, a motor on said supporting means, a verticalhollow torque shaft comprising a pair of telescoping sections, a bearingin said projecting portion for rotatably supporting the upper section, abearing on the lower section for supportling the cutter, a screwsuspended in said upper section and rotatable therewith, and a nut xedto said lower section and engaging said screw.Y

5. In a machine of the class described, movable .supporting meansincluding an elevated horizontally projecting portion,'an elongatedvertically translatable horizontal kerf cutter beneath said portion, amotor on said supporting means, a vertical hollow torque shaftcomprising a pair of telescoping sections, a bearing in said projectingportionY for rotatably supporting the upper section, a bearing on thelower` section for supporting the cutter, a screw suspended in saidupper section and rotatable therewith, a nut xed to said lower sectionand engaging said screw, and means for restraining the rotation of saidscrew while the nut is rotating.

6. In a machine of the class described, supporting means, a kerf cutter,and adjustable means between the two for supporting and driving the kerfcutter, said means comprising a hollow vertical torque shaft comprisingtelescoping upper and lower sections, a screw within the upper section,a flange on the upper end of the screw overlying and resting upon thetop edge of the upper section, and a nut xed to the lower section andengaging the screw.

'7. In a machine oi the class described, supporting means, a kerfcutter, and adjustable means between the two for supporting and drivingthe kerf cutter, said means comprising a hollow vertical torque shaftcomprising'telesooping upper and lower sections, a screw within theupper section, a liange on the upper end of the screw overlying andresting upon the top edge of the upper section, a nut fixed to the lowersection and engaging the screw, and means'on the supporting means forengaging said iiange to lock the screw against rotation with said shaft.

8. In a machine or" the class described, movable supporting meansincluding a horizontally projecting portion provided with a verticalbearing aperture, a rsleeve concentric with said aperture,

a flange on said sleeve overlying and supported upon the top margins ofsaid aperture, a second sleeve splined withinY the first and projectingtherebelow, a screw suspended withinthe rst sleeve, a nut fixed tothe'second sleeveand engaged by said screw, a flange provided on thelower end of the second sleeve, a kerf cutter mounting membersurrounding the lower end of said second sleeve and supported by itsvflange, and means for inducing relative rotation of the screw and nutfor vertically adjusting said mounting' member.

9. In a machine'of the class described, movable supportlng meansincluding a 'horizontally projecting portion provided with a verticalbearing aperture, a sleeve concentric with said aperture, a flange onsaid sleeve overlying and supported upon the top margins of saidaperture, a second sleeve splined within the rst and projectingtherebelow, a screw suspended within the rst sleeve, a nut fixed to thesecond sleeve and engaged by said screw,`a flange provided on the lowerend of the second sleeve, a kerf cutter mounting member surrounding thelower end of said second sleeve and supported by its ilange, a guidesleeve on said mounting memberv projecting within said aperture andsurroundhig the lower end of the rst named sleeve, and means forinducing relative rotation of the screw andnut for vertically adjustingsaid mounting member.

10. In a machine of the class described, movable supportlng meansincluding a horizontally projecting portion provided with a verticalbearing aperture, a sleeve concentric with said aperture, a flange onsaid sleeve overlying and sup- Y ported upon the top lmargins of saidaperture,

a second sleeve splined within the first and projecting therebelow, ascrew suspended within the rst sleeve, a 'nut xed to the second sleeveand engaged by said screwa flange provided `on the lower end fof. `the.second sleeve, a -kerf cutter mounting member surrounding the lower endof said second sleeve and supported by its ilange,

a guide sleeve on said mounting .member projecting within said apertureand surrounding the lower end of the iirst named sleeve, guide meansdependingfrom said projecting portion, means in connection with saidmounting member and slidably engaging said guide means, and means forinducing relative rotation of the screw and nut for vertically adjustingsaid mounting member. n

1l. In a machine of the class described, movable supporting meansincluding a` horizontally projecting portion provided with a verticalbearing aperture, a sleeve concentric with said aperture, a flange onsaid sleeve overlying and sup- 40" end of said second sleeve andsupported by its nange, a bearing member in which said mountported uponthe top margins of said aperture, a second sleeve splined within thenrst and projecting therebelow, a screw suspended within the firstsleeve, a nut xed to the second sleeve and engaged by said screw, aflange provided on the lower end of the second sleeve, a kerf cuttermounting member surrounding the lower end of said second sleeve andsupported by its flange, means for securing said mounting member againstrotation, and means for inducing relative rotation of the screw and nutfor vertically adjusting said mountingmember.

`12. In a machine ofthe class described, movable supporting meansincluding a iriorizontally projecting portion provided with a verticalbearing aperture, a sleeve concentric with said aperture, a ange on saidsleeve overlying and supported upon the top margins of said aperture, asecond sleeve splined within the nrst and projecting therebelow, a screwsuspended within the first sleeve, a nut fixed to the second sleeve andengaged by said screw, a iiange provfded on the lower end of the secondsleeve, a lrerf cutter mounting member surrounding the lower ing memberis rotatable, means securing said bearing member against rotation, meansfor locking said mounting member to s aid bearing mem- 'ber in differentangular positions, and means for inducing relative rotation of the screwand nut for vertically adjusting said mounting member.

13. In a machine of the class described, movable supporting meansincluding a horizontally projecting portion, a kerf cutter beneath saidportion-means for vertically translating said cutter relative to saidportion, said translating means including a rotary member non-rotational.during cutter translation, a locking element for 'said rotary member,and cam and lever mechanism automatically actuated at the upper limit ofmovement of the cutter to disengage said locking element from saidrotary member and thereby arrest the cutter movement.

14. In a machine of the class described, movable supporting meansincluding a horizontally projecting portion, a korf cutter beneath saidportion, means for vertically translating said cutter relative to saidportion, said translating means including a rotary member non-rotationalduring cutter translation, a locking element for said rotary member, andmeans tensioned at the lower limit of movement o1" the cutter toautomatically disengage said locking element from said rotary member andthereby arrest the cutter movement.

15. In a machine of the class described, mov- 'able supporting meansincluding a horizontally p projecting portion, a kerf cutter beneathsaid cutter,

ments for said shatt, and common means for.

portion, means for vertically translating said cutter relative to saidportion, said translating means including a rotaryl membernon-rotational during cutter translation, a locking element for saidrotary member, and means automatically actuated at the upper and lowerlimits of movement of the cutter to disengage said locking element fromsaid rotary member and thereby arrest the cutter movement. y

16. In a machine of the class described, a supporting frame, a kerfcutter adjustable relative to said frame, a motor on said frame, atorque shaft adjustable as to length operative between said motor andsaid cutter, a guide bearing supported from said frame concentricto andsurrounding a portion of said shaft, and a guide bearing concentric toand surrounding another portion of said shaft and adjustable with saidshaft.

i7. In a machine of the class described, a supporting frame, a kerfcutter adjustable relative to said frame, a motor on said frame, atorque shaft adjustable as to length operative between said motor andsaid cutter, a guide bearing supported from said frame concentric to andsurrounding a portion of said shaft, a guide bearing concentric to andsurrounding another portion of said shaft and adjustable with saidshaft, said guide bearings beh/ig in telescoping relation to eachother.

- 18. In a machine of the class described, a supporting frame, a kerfcutter adjustable relative to said frame, a motor on said frame, atelescoping torque shaft between said motor and said cutter, andtelescoping non-rotating housing elements for said shaft.

le. In a machine ci the class described, a supporting traine, a kerfcutter adjustable relative to said frame, a motor on said frame, atelescoping torque shaft between said motor and said telescopingnon-rotating housing eletelescoping the shaft and the housing elementsrfor adjusting the iserf cutter.

20. In a mining machine, a` supporting frame,

a hert cutter adjustable relative to said frame,

a motor on. said frame, a tcrqueshaft between the motor and cutter andcomprising telescoping tubular elements, and means for adjusting saidshaft comprising a screw concentric therewith in threaded engagementwith one of the tubular elements and having a thrust engagement withanother of said tubular elements.

21. In a machine of the class described, a supporting frame, an armprojecting horizontally from said frame, a sieeve iixed to and dependingfrom the free end oi said arm, a second sleeve telescopically engagedwith the lower portion of the rst, a kerf cutter having a rotary driveelement at the bottom of said second sleeve and coaxial therewith, meanspreventing rota-v tion of said second sleeve, a motor on said frame,driving connections between said motor and said rotary element includinga longitudinally extensible and collapsible torque shaft within saidsleeves, and means for adjusting the kerf cutter toward and away fromthe frame.

22. In a machine of the class described, a supporting frame, an armprojecting horizontally from said frame, a sleeve fixed to and dependingfrom the free end of said arm, a second sleeve telescopicallyengagedwith the lower portion of the rst, a kerf cutter having a rotary driveelement at the bottom of said ,second sleeve and coaxial therewith,means preventing rotation of lscrew means serving as thrust`transmitting said second sleeve, a motor on said frame, drivingconnections between said motor and said rotary element including alongitudinally extensible and collapsible hollow torque shaft withinsaid sleeves, and means for adjusting the kerf cutter toward and awayfrom the frame, said last named means including a screw extendinglongitudinally of and within saidhollowtorque shaft.

23. In a mining machine, the combination with a supporting frame,.of akerf-cutter comprising a cutter frame, means for driving saidkerf-cutter comprising an extensible shaft mounted between saidsupporting frame and said kerf-cutter, an extensible enclosure for saidshaft between said frames, and guiding mechanism between said framesadapted to prevent swinging movement of said cutter frame on the axis ofsaid shaft.

24. In a mining machine, the combination with a support, of aKeri-cutter adjustablerelatively thereto, an extensible hollow torqueshaft connected to said kerf-cutter, said shaft comprising a pair oftelescoping portions, a screw concentric to said shaft, a nut xed to oneof said portions, and means securing saidA screw against longitudinalmovement relative to the other of said portions.

25. In a mining machine,-the combination with supporting means, of akerf-cutter, and means between said supporting means and said kericutterfor adjusting the position of the latter, said meansy comprisingtelescoping sections, a screw within one section, a flange on one end ofthe screw and resting against one end of said section,and a nut'rlxed tothe other section and engaging said screw. i Y

26. In a mining machine, the combination with supporting means, of aKeri-cutter, and adjustable means between said supporting means and saidkerf-cutter forpositioning the latter and driving the same, said meanscomprising a torque shaft having telescoping sections, a screw ,withinone section,y a ange on one end of said screw resting upon one'end ofsaid' section, and a nut fixed to the other section and meshing withsaid screw. Y

27. In a machine of the class described, a base member, a turntablerotatableA on said base member, an arm projecting from said turntable inperpendicular relation to the axis of rotation of the turntable, saidarm having a portion overlying the turntable and provided with aplurality of longitudinally extending slots, clamping means extendingthrough said slots in connection with the turntable, the arm beinglongitudinally displaceablerelative to the turntable upon loosening saidclamping means, said arm having a perpendicular flange extending infront of the turntable edge, and screw means mounted in said flange insubstantially perpendicular relation thereto and abutting the turntableedge, said means and being adjustable to effect longitudinaldisplacement of the arm relative to the turntable.

28. In a machine of the class described, the combination with asupporting frame, of a kerf cutter bodily adjustable relative thereto,an extensible torque shaft comprising telescoping sections for drivingsaid kerf cutter in all of its adjusted positions, driving means for thetorque shaft, a screw and nut for adjusting the kerf cutter relative tosaid frame, and means for effecting relative rotation of the screw andnut, the screw being housed within the torque shaft, but being extrinsicto the torque action of the torque shaft.

29. YIn a machine of the class described, the combination with asupporting frame, of a kerf cutter bodily adjustable relative thereto,an extensible torque shaft comprising telescoping sections for drivingsaid kerf cutter in all of its adjusted positions, driving means for thetorque shaft, a screw and nut for adjusting the kerf cutter relative tosaid frame, and means for rotating the nut relative to the screw, thescrew being housed within the torque shaft, but being extrinsic to thetorque action of the torque shaft.

30. In a mining machine, a support including a horizontally projectingarm, a downwardly extending tubular projection adjacent the free end ofthe arm, means' defining `a vertical guideway extending downwardly fromthearm behind the tubular projection, a frame below the tubularprojection and engaged in said guideway for Vvertical adjustmenttherealong, the Yguideway holding the frame against rotation about avertical axis, a tubular member telescoped in said projection and havingits lower end journaled insaid frame, a cutter bar `in connection withthe lower end of said tubular member and rotatable therewith, means forconnecting the cutter bar and frame to hold the cutter bar againstmovement about the axis of said tubular member, means for driving thecutter bar, and means for vertically adjusting the cutter bar.

31. In a mining machine, a support including a horizontally projectingarm, a downwardly extending tubular projection adjacent the free end ofthe arm, means 'dening a vertical guideway extending downwardly from thearm behind the tubular projection, a frame below the tubular projectionand engaged in said guideway for vertical adjustment therealong, theguideway holding the frameagainst rotation about a vertical axis, atubular member telescoped in said projection and having its lower endjournaled in said frame, a cutter bar in connection with the lower endof said tubular member'and rotatable therewith, means for connecting thecutter bar and frame Vto hold the cutter bar against movement about theaxis of said tubular member, means Vforl driving the cutter bar,andmeans for vertically adjusting the cutterrbar, said drivingmeansincluding an extensible torque shaft within said tubular projection andmember.

32. In a mining machine, a support including a horizontally projectingarm, a downwardly extending tubular projection adjacent the free endl ofthe arm, means dening a vertical guideway extending downwardly from thearm behind the tubular projection, a frame below the tubular projectionand engaged in said guideway for vertical adjustment therealong, theguideway holding the frame against rotationabout a vertical axis, atubular member telescoped in said projection and having its lower endjournaled in said frame, a cutter bar in connection with the lower endof said tubular member and rotatable therewith, means for connecting thecutter bar and frame to hold the cutter bar Vagainst; movement about theaxis of said tubular member, means for driving the cutter bar, and meansfor vertically adjusting the'cutter bar, said adjusting means includingscrew and nut means within said tubular projection and member.

33. In a lmining machine, a support including a horizontally projectingarm, a downwardly extending tubular projection adjacent the free end ofthe arm., means defining a vertical guideway extending downwardlyY fromthe arm behind the tubular projectioma frame below the tubularprojection and engaged in said guideway for vertical adjustmenttherealong, the guideway holding the frame against rotation about avertical axis, atubular member telescoped in said projection and havingits lower end journaled in said frame, a cutter bar in connection withthe lower end of said tubular member and rotatable therewith, means forconnecting the cutter bar and frame to hold the cutter bar againstmovement about the axis of said` tubular member, 'means fork driving thecutter bar, means for vertically adjusting the cutter bar, said drivingmeans including a telescoping torque shaft within said tubularprojection and member and said adjusting means including a screw housedin a portion of said torque shaft and in threaded engagement withanother portion thereof.

34. In a machine of the class described, the combination with asupporting frame, of a cutter bar bodily adjustable relative thereto, acutter chain circulatory on said cutter bar, an extensible torque shaftcomprising telescoping sections'for driving said cutter chain in alladjusted positions of the cutter bar, driving means for the torqueshaft, 'a screwand nut concentric with the torque shaft for adjustingthe cutter bar relative to the support, means for effecting relativerotation of the screw and nut, the screw being extrinsic to the torqueaction of the torque shaft, and means operative to hold the cutter baragainst swinging about the axis of said torque shaft in all adjustedpositions of the cutter bar whiley permitting free adjustment of thecutter bar.

35. In ar machine of the class described, the combination with asupporting frame, of a cutter bar bodily adjustable relative thereto,aicutter chain circulatory on saidcutter bar, an extensible torque shaftcomprising telescoping sections for driving said cutter chain in alladjusted positions of the cutter bar, driving means for the torqueshaft, a screw and nut concentric with the torque shaft for adjustingthe Ycutterbarl relative to the support, means for effecting relativerotation of the screw and nut, the screw being ex- :j trinsic to thetorque action of the torque shaft,

and means operative to hold the cutter bar against swinging about theaxis of'said torque shaft inall adjusted positions of the cutter barwhile permitting free adjustment of the cutter bar, said last namedmeans comprising a guideway on the supporting frame parallel to saidtorque shaft and means on the cutter bar slidably engaging saidguideway.

36. In a machine of the class described, the combination with asupporting frame, of a kerf cutterf bodily adjustable relative thereto,said kerf cutter comprising anl elongated cutter bar and an endlesschain cutter adapted totravel on the periphery of said bar, anextensible -torque shaft comprising telescoping'sections for drivingsaid kerf cutter in all of its adjusted positions, driving means for thetorque shaft, a screw and nut concentric with the torque shaft andconnecting said supporting frame and cutter bar for adjusting the kerfcutterrelative to said frame,

and means for effecting relative rotation of the screw and nut, thescrew being extrinsic to the torque action of the torque shaft.v

`37. In a machine of the class described, the combination Awith asupporting frame, of a kerf cutter bodily adjustable relative thereto,vsaid kerf cutter` comprisingan elongated cutter bar and an endlesschain cutter adapted to travel on the periphery of said bar, anextensible torque shaft comprising telescoping sections for drivinfrsaid kerf cutter in all of its adjusted positions, driving means for thetorque shaft,'a screw and nut concentric with the torque shaft andconnecting said supporting frame and cutter bar for adjusting the kerfcutter relative to said frame, and means for rotating the nut relativeto the screw, the screw being extrinsic to the torque action of thetorque shaft.

38. In a mining machine, a portable frame, a motor carried by saidframe, a kerf cutter supported by vsaid frame, power transmission meansbetween said motor and said kerf cutter comprising horizontally spacedsprockets arranged on vertical axes at the top of said frame and anendless chain engaging said sprockets, and controllable means driventhrough said chain for adjusting said kerf cutter relative to said frameinto different planes parallel to each other.

NILS D. LEVIN.v `ERNST FEQDOR MULLER.

i 1st

